Rotary scraper for finishing artificial dentures.



Patented-Mg. 5, I902.

- 4 T. J. BOYCE. ROTARY SCRAPER FOR FINISHING ARTIFICIAL DENTURES.

(App lication filed July 29, 1901.]

(N0 Hildel.)

UNITED STATES PATENT FFICE.

THOMAS J. BOYCE, OF CHICAGO, ILLINOIS.

ROTARY SCRAPER FOR FINISHING ARTIFICIAL DENTURES.

SPECIFICATION forming part of Letters Patent N 0. 706,013, dated August 5, 1902.

Application filed July 29,1901.

T0 aZZ whom, it may concern:

Be it known that I, THOMAS J. BOYCE, a citizen of the United States, residing at Chicago, county of Cook, State of Illinois, have invented a certain new and useful Improvement in Rotary Scrapers for Finishing Artificial Dentures; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates in general to rotary scrapers, and more particularly to devices of this character which are especially adapted for finishing dentures.

In the construction of rotary scrapers of the type referred to previous to my invention the cutting blades or edges and the body portion have been formed integrally, which has necessitated the use of a grade of metal possess: ing the hardness requisite for the cutting blades or edges. The initial cost, as well as that of frequent sharpening of the cutting edges, has rendered such devices comparatively expensive.

The object of my invention is to provide a rotary scraper of the class referred to in which the cutting or abrading surface and body portion are formed of different materials, so that the former may have the desired hardness, while the latter may consist of any ma terial suitable for supporting and having secured thereto the cutting-surface.

A further object of my invention is to provide a rotary scraper of the class referred to which will be efficient in use, simple in construction, and inexpensive in manufacture.-

My invention will be more fully described hereinafter with reference to the accompanying drawings, and in which the same is illustrated as embodied in several convenient and practical forms, and in which? Figure 1 is a side elevational view of one form of my invention; Fig. 2, a transverse section taken on the line 2 2 of Fig. 1; Fig. 3, a view in side elevation'of another form of my invention; Fig. 4, a transverse sectional view of Fig. 8; Fig. 5, a transverse section of another embodiment of my invention; Fig. 6, a longitudinal section on the line 6 6 of Fig. 5,

Serial No. 70,057. (No model.)

and Fig. 7 a'central vertical section of still another form of my invention.

Similar reference characters are used to indicate similar parts in the several figures of the drawings.

My invention consists, essentially, in a rotary scraper for finishing dentures, in which the cutting-surface, which is shown as comprising a series of blades, is formed separately from the body portion and secured thereto in any suitable manner, preferably, however, by

so casting the body portion that it will partially surround the cutting-surface and thereby securely unite the cutting-surface and body portion.

Referring more particularly to Figs. 1 and 2, reference-letter .A indicates the cuttingsurface, which is shown as comprising a series of blades which are partially embedded in the body portion B. The blades may be arranged in any desired relation to each other and to the body portion. For convenience, however, they are shown as extending in straight lines from the enlarged end of the body portion to the opposite end thereof, where they converge to a central point. The cutting-blades are preferably formed thin and of uniform crosssection, so that as they wear down during the use of the device they will continue sharp, and thereby avoid the necessity of resharpening the blades after the .device has been subjected to a certain amount of use. The body portion B may-be made of any suitable material for supporting and having secured thereto the cutting or abrading surface. The body portion is, however, preferably formed of cast metal, inasmuch as it aifords a convenient manner for securing the cutting-surface thereto, the blades being placed in the desired relation to each other and the body portion then cast, so as to partially surround the several blades constituting the cuttingsurface. The cutting-blades A may be provided with apertures a, through which the metal of the body portion extends,a11d thereby securely attaches the blades to the body por tion. 1) indicates a'central opening affording means for securing the device to a lathe.

In Figs. 3 and 4 is illustrated another embodiment of my invention, in which the rotary scraper consists in a substantially flat central portion around which is located an annular ment of my invention, in which the cuttingsurface A consists in a series of beveled blades located in close engagement with each other, as clearly shown in Fig. 5. Each of the blades constituting the cutting-surface A is provided with an opening (1 preferably of dovetail shape, into which the body portion B extends, and thereby securely attaches the blades thereto. 5 indicates an opening for affording a convenient attachment to a lathe.

In Fig. 7 I have illustrated another modification of my invention, in which referenceletter A indicates the cutting or abrading surface, consisting of a series of thin blades similar to those illustrated in Figs. 1 and 2, such blades being formed with openings a therethrough. Thebody portion B partially surrounds each of the blades and passes through the openings at therein, thereby securely holding the blades in the desired relative position to each other and to the body portion. 19 6 indicate openings at either side of the rotary scraper, so that the device may be so secured to the lathe as to rotate it in either direction, according to which of the two openings 1) is used to secure the device to the lathe.

The operation of my invention is as follows: The device is rotated, preferably, by securing it to a lathe, and while it is in motion the denture which is to be finished or any other article which is to be abraded or polished is held in contact with the cuttingsurface,which quickly and efficiently finishes the denture. When the cutting-surface consists ofa series of uniformly thin blades, preferably of steel, the device may be continued in use without sharpening, as would be necessary if the cutting-surface consisted of V-shaped projecting edges, such as would be formed were the entire device integral, the cutting edges being produced on the outer surface of the body portion.

While I have described more or less precisely the details of construction of the several embodiments of my invention, I do not wish to be understood as limiting myself thereto, as I contemplate changes in form,the proportion of parts, and the substitution of equivalents, as circumstances may suggest or render expedient without departing from the spirit of my inventio n.

Having now fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. As an article of manufacture, a rotary scraper for finishing artificial dentures consisting in a body portion, and a separate curved cutting-surface secured to said body portion and extending toward the axis of the scraper at an end of the same, substantially as described.

2. In a rotary scraper for finishing artificial dentures, the combination with a body portion, of a curved cu tting-surface having openings therein into which the body portion extends and thereby securely unites the cutting-surface and body portion, substantially as described.

3. In a rotary scraper for finishing artificial dentures,- the combination with a series of curved cutting-blades having openings therein, of a cast-metal body portion partially surrounding said blades and extendingthrough the openings formed therein, substantially as described.

4. In a rotary scraper for finishing artificial dentures, the combination with a series of semicircular cutting-blades, of a body portion in which said blades are partially embedded said body portion having openings formed therein concentrically with the ends of said blades and at opposite points on its circumference, substantially as described.

In testimony whereof Ihavehereunto sub scribed my name in the presence of two sub- In presence of.-

Gno. L. WILKINSON, CLARA C. CUNNINGHAM. 

